对日盲紫外预警和红外预警的相关发展现状进行了综述。针对当前对临近空间导弹预警载荷的应用需求,提出了一种覆盖日盲紫外(250~280 nm)、中波红外(3 000~5 000 nm)双波段预警系统。系统采用双波段实现对导弹等**目标的探测和预警,可以有效的减少虚警率。该光学系统利用一个离轴三反系统作为主光学系统,利用分束器分别实现对两个波段的分光。根据两个波段光学系统所使用的探测器以及相应的应用需求,完成了对两个波段光学系统结构计算与光学设计工作。设计完成之后,两个波段光学系统的MTF在奈奎斯特频率分别为: 日盲紫外MTF＞0.8@39 lp/mm,中波红外MTF＞0.8@17 lp/mm,两个光学系统最大RMS光斑直径小于一个探测器的尺寸,单个像元能量集中度大于80%。

The relevant development status of solar blind ultraviolet and infrared warning is reviewed. According to current application demands for the missile warning payload in near-space, a dual-band early warning system is presented, which covers the solar blind ultraviolet 250~280 nm and middle wavelength infrared (MWIR) 3 000~5 000 nm. The dual-band system is used to realize the detection and warning to military targets such as missile, which can effectively reduce the false alarm rate. A three-mirror off-axis system is taken as the main anti-optical system and the splitter is used to realize beam splitting on two spectral bands. According to the detector used by the optical systems on two bands and the corresponding application needs, the structure calculation and optical design of the optical system are completed. After the design is completed, the modulation transfer function (MTF) of two bands of the optical system at Nyquist frequency are solar blind ultraviolet MTF>0.8@39 lp/mm and MWIR MTF>0.8@17 lp/mm respectively. The maximum root mean square (RMS) spot diameter of two optical systems is smaller than the size of a detector and the single cell energy concentration is greater than 80%.